Shutdown old Notary Infrastructure

[directionless]

About a year ago, we moved launcher from using the old Notary infrastructure to using the new TUF infrastructure -- https://github.com/kolide/launcher/issues/1577

We should start shutting down the old notary infra. This is running across GKE and CloudSQL

I'm going to do this in a few steps:

• [X] 2025-04-09 Set the notary-server deployments from 5 to 0
• [x] 2025-09-14 Delete notary GKE
• [ ] 2025-09-14 shutdown notary Cloud SQL
• [ ] ~backup the sql databases / keys~ (no need to backup, fix is to install new launcher)
• [ ] delete the CloudSQL setup